[PATCH v3 06/11] dt-bindings: add documentation for rk3188 clock and reset unit

[Heiko Stübner]

This add bindings documentation for the clock and reset unit found on
rk3188 SoCs from Rockchip.

Signed-off-by: Heiko Stuebner <heiko at sntech.de>
---
 .../bindings/clock/rockchip,rk3188-cru.txt         | 59 ++++++++++++++++++++++
 1 file changed, 59 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/clock/rockchip,rk3188-cru.txt

diff --git a/Documentation/devicetree/bindings/clock/rockchip,rk3188-cru.txt b/Documentation/devicetree/bindings/clock/rockchip,rk3188-cru.txt
new file mode 100644
index 0000000..56d1ef5
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/rockchip,rk3188-cru.txt
@@ -0,0 +1,59 @@
+* Rockchip RK3188 Clock and Reset Unit
+
+The RK3188 clock controller generates and supplies clock to various controllers
+within the SoC and also implements a reset controller for SoC peripherals.
+There exist two variants of the rk3188 SoC, the rk3188 and rk3188a, with
+slight differences in the pll handling.
+
+Required Properties:
+
+- compatible: should be "rockchip,rk3188-cru" or "rockchip,rk3188a-cru"
+- reg: physical base address of the controller and length of memory mapped
+  region.
+- #clock-cells: should be 1.
+- #reset-cells: should be 1.
+
+Optional Properties:
+
+- rockchip,grf: phandle to the syscon managing the "general register files"
+  If missing pll rates are not changable, due to the missing pll lock status.
+
+Each clock is assigned an identifier and client nodes can use this identifier
+to specify the clock which they consume. All available clocks are defined as
+preprocessor macros in dt-bindings/clock/rk3188-cru.h header and can be used
+in device tree sources.
+
+External clocks:
+
+There are several clocks that are generated outside the SoC. It is expected
+that they are defined using standard clock bindings with following
+clock-output-names:
+ - "xin24m" - crystal input - required,
+ - "xin32k" - rtc clock - optional,
+ - "ext_hsadc" - external HSADC clock - optional,
+ - "ext_cif" - external camera clock - optional,
+ - "ext_rmii" - external RMII clock - optional,
+ - "ext_jtag" - externalJTAG clock - optional
+
+Example: Clock controller node:
+
+	cru: cru at 20000000 {
+		compatible = "rockchip,rk3188-cru";
+		reg = <0x20000000 0x1000>;
+		rockchip,grf = <&grf>;
+
+		#clock-cells = <1>;
+		#reset-cells = <1>;
+	};
+
+Example: UART controller node that consumes the clock generated by the clock
+  controller:
+
+	uart0: serial at 10124000 {
+		compatible = "snps,dw-apb-uart";
+		reg = <0x10124000 0x400>;
+		interrupts = <GIC_SPI 34 IRQ_TYPE_LEVEL_HIGH>;
+		reg-shift = <2>;
+		reg-io-width = <1>;
+		clocks = <&cru SCLK_UART0>;
+	};
-- 
1.9.0